KR20190139608A - Hvdc output control device and method therof - Google Patents

Abstract

The present invention provides an HVDC output control device which prevents overload in case of a failure of a main transmission line or a wide area blackout due to a supply and demand imbalance in an HVDC system. According to the present invention, the HVDC output control device, as the HVDC output control device for a first transmission line transmitting extra-high voltage direct current from a second region to a first region, comprises: an input unit inputting input data of the first region and the second region including a power flow amount and a facility capacity of a second transmission line flowing into the first region and the second region; a calculation unit calculating an output variation value to be changed and a new output value obtained by adding the output variation value to a previous output value based on the input data from the input unit; and a control unit outputting the new output value calculated by the calculation unit to the first transmission line.

Description

HVDC output control device and its method {HVDC OUTPUT CONTROL DEVICE AND METHOD THEROF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultra-high voltage direct current transmission (hereinafter referred to as HVDC) system, and more particularly, to an HVDC output control device and a method thereof.

(Patent Document 1) KR10-2013-0035739 A

The present invention provides an HVDC output control device and a method for preventing wide area power failure due to overload or supply / demand imbalance in case of failure of a main transmission line in an HVDC system.

An object of the present invention is the HVDC output control device for a first transmission line for transmitting high voltage direct current from the first region to the second region,

An input unit configured to input input data of the first region and the second region including a tidal flow amount and facility capacity of a second transmission line flowing into the first region and the second region;

A calculation unit calculating an output variation value to be changed and a new output value obtained by adding the output variation value to a previous output value based on the input data from the input unit; And

It can be achieved by providing an HVDC output control apparatus according to the present invention comprising a control unit for outputting the new output value calculated by the calculation unit to the first transmission line.

An object of the present invention in the HVDC output control method for a first transmission line for transmitting ultra-high voltage direct current from the first region to the second region,

An input step of inputting input data of the first region and the second region including the amount of tidal current and facility capacity of the second transmission line flowing into the first region and the second region;

Calculating a new output value obtained by adding an output variation value to be changed and the output variation value to a previous output value based on the input data input in the input step; And

It can be achieved by providing an HVDC output control method according to the present invention comprising a control step of outputting the new output value calculated in the operation step to the first transmission line.

According to a preferred aspect of the present invention, the input unit, the current value of the second transmission line flowing into each of the first region and the second region and the second transmission line of each of the first region and the second region Enter the capacity value of the furnace.

 According to another preferred aspect of the present invention, the input unit further inputs operation state information of closing or opening of the circuit breaker of the second transmission line.

 According to another preferred aspect of the present invention, the calculation unit calculates the output variation value by the following equation.

는 상기 출력변동 값,

는 상기 제 1 지역으로 전력이 유입되는 n개의 송전선로 i의 조류 값의 합(단위는 MW),

는 이전의 출력 값(단위는 MW),

는 상기 제 2 지역으로 유입되는 x개의 송전선로 k의 조류 값의 합(단위는 MW),

는 상기 제 2 지역으로 유입되는 x개의 송전선로 k의 설비용량 값의 합(단위는 MVA), X와 Y는 보정계수이다.here,

Is the output variation value,

Is the sum of the tidal current values of the n transmission lines i into which power is introduced into the first region (unit is MW),

Is the previous output value (unit is MW),

Is the sum of tidal current values of x transmission lines k flowing into the second region (unit is MW),

Is the sum of the capacity values of the x power transmission lines k flowing into the second region (unit is MVA), and X and Y are correction factors.

According to another preferred aspect of the present invention, the calculating unit is adapted to calculate the output fluctuation value only for the capacity value of the second transmission line in which the circuit breaker of the second transmission line in the second region is closed. The facility capacity value of the second transmission line in which the circuit breaker of the second transmission line in the second region is open is excluded from the calculation of the output variation value.

여기서,

는 새로운 출력 값(단위 MW),

는 이전의 출력 값,

는 상기 출력변동 값이다.According to another preferred aspect of the present invention, the calculation unit calculates a new output variation value by the following equation. In other words,

here,

Is the new output value in MW,

Is the previous output value,

Is the output variation value.

According to another preferred aspect of the present invention, the input step is a tidal current value of the second transmission line flowing into each of the first region and the second region and the installed capacity of the second transmission line of the second region. This involves entering a value.

According to another preferred aspect of the present invention, the input step further includes inputting operation state information of closing or opening of the circuit breaker of the second transmission line.

According to another preferred aspect of the present invention, the calculating step calculates the output variation value by the following equation.

는 상기 출력변동 값,

는 상기 제 1 지역으로 전력이 유입되는 n개의 송전선로 i의 조류 값의 합(단위는 MW),

는 이전의 출력 값(단위는 MW),

는 상기 제 2 지역으로 유입되는 x개의 송전선로 k의 조류 값의 합(단위는 MW),

는 상기 제 2 지역으로 유입되는 x개의 송전선로 k의 설비용량 값의 합(단위는 MVA), X와 Y는 보정계수이다.here,

Is the output variation value,

Is the sum of the tidal current values of the n transmission lines i into which power is introduced into the first region (unit is MW),

Is the previous output value (unit is MW),

Is the sum of tidal current values of x transmission lines k flowing into the second region (unit is MW),

Is the sum of the capacity values of the x power transmission lines k flowing into the second region (unit is MVA), and X and Y are correction factors.

According to another preferred aspect of the present invention, the calculating step, wherein the circuit breaker of the second transmission line in the second region only calculates the output variation value of the installation capacity value of the second transmission line is closed. And the installation capacity value of the second transmission line in which the circuit breaker of the second transmission line in the second region is open is excluded from the calculation of the output variation value.

According to another preferred aspect of the present invention, the calculating step calculates a new output variation value by the following equation.

는 새로운 출력 값(단위 MW),

는 이전의 출력 값,

는 상기 출력변동 값이다.here,

Is the new output value in MW,

Is the previous output value,

Is the output variation value.

The HVDC output control device or the HVDC output control method according to the present invention, in the first transmission line for transmitting high voltage direct current from the second region to the first region, the second transmission line flowing in each of the two regions in connection Since the HVDC output to be output to the first transmission line is controlled in consideration of the amount of tidal current and the facility capacity of the second region, it is possible to achieve the effect of eliminating overload of the second region and achieving optimum tidal flow control.

The HVDC output control device or the HVDC output control method according to the present invention, the current flow of the second transmission line flowing into the first region and the second region and the installed capacity of the second transmission line of the second region Since the value is inputted, it is possible to control the HVDC output to be output to the first transmission line in consideration of the flow rate of the second transmission line flowing into each of the two regions by connecting the two regions and the facility capacity of the second region. Control and overload elimination of the second zone can be obtained.

The HVDC output control device or the HVDC output control method according to the present invention further inputs the operation state information of the closing or opening of the circuit breaker of the second transmission line of the second region, and thus the second of the second region of the second region. When calculating the sum of the equipment capacity of the transmission line, the circuit capacity of the second transmission line in which the circuit breaker is open, that is, the capacity of the second transmission line in the faulty state can be obtained.

The HVDC output control apparatus or the HVDC output control method according to the present invention is based on a calculation formula considering the flow rate of the second transmission line flowing into each of the two regions connected to each other, the installed capacity of the second region and the previous output value. Since the output fluctuation value is calculated and determined, it is possible to obtain the effect of overload elimination and optimum tidal flow control in the second region.

Since the HVDC output control apparatus or the HVDC output control method according to the present invention is configured to add the output variation value calculated to the previous output value and finally output it as a new output value, the optimum tidal flow control can be obtained.

1 illustrates output control by considering the sum of inflow and outflow power of each of two zones and the power load of each of two zones in outputting HVDC output power from the second zone to the first zone according to the present invention. Output control conceptual diagram showing the concept,
2 is a system configuration diagram of the HVDC output control device according to the present invention showing the system configuration of the HVDC output control device and the HVDC output unit according to the present invention,
3 is a flowchart illustrating the operation of the HVDC output control device according to the present invention and the HVDC output control method according to the present invention.

The object of the present invention and the constitution and effects of the present invention to achieve the same will be more clearly understood by the following description of the preferred embodiment of the present invention with reference to the accompanying drawings.

First, the output control conceptual diagram according to the present invention will be described with reference to FIG.

When region 1 is referred to as region A and region 2 is referred to as region B, the power flowing into the region 1 (hereinafter mixed with region A) is defined as P _{PA _i} {where i is a natural number from 1 to n. Indicates each of the n transmission lines 30a flowing into the area A}, and the power flowing out of the area A is P _{NA_i} {where i is the natural water from 1 to n, where n transmission lines 30b are discharged from the area A (30b). ), And load the load of region A into P _{A_load and} the power flowing into the second region (hereinafter mixed with region B) P _{PB _i} {where i is a natural number from 1 to n, Indicates each of the n transmission lines 20a flowing into the region}, and the power flowing out of the region B is P _{NB _i} {where i is the natural water from 1 to n, where n transmission lines 20b are discharged from the region A; ) indicates the respective} and a load on the B area referred to as a P _{B_load} .

In addition, a transmission line for transmitting ultra-high voltage direct current from the second region to the first region will be referred to as a first transmission line (see reference numeral 10 in FIG. 1), and each of the incoming transmission lines in the first region and the second region will be referred to as a transmission line. Overflow transmission lines are referred to as second transmission lines (see 20a, 20b, 30a, 30b in Fig. 1).

HVDC output power output from the second region to the first region, aka HVDC operation value, will be referred to as P _HVDC .

The HVDC output control apparatus and method according to the present invention takes into account the sum of the inflow power and the outflow power of each of the two regions and the power load of each of the two regions in outputting the HVDC output power from the second region to the first region. Output control.

2 and 3 will be described in more detail with respect to the HVDC output control apparatus and method according to the present invention.

2 is a system configuration diagram of the HVDC output control device according to the present invention showing the system configuration of the HVDC output control device and the HVDC output unit according to the present invention.

2, the entire system including the HVDC output control device according to the present invention includes an input data source SOURCE 40, the HVDC output control device 100 and the HVDC power transmission unit according to the present invention. 200).

The input data source 40 is installed in each of all transmission lines in the first region and the second region so that the amount of tidal flow (input power amount and inflow power amount) and facility capacity per transmission line and Means for providing operation state information of circuit breakers for each transmission line as input data, for example, a current transformer for detecting the amount of current flowing through the transmission line, and a voltage transformer for detecting the voltage of the transmission line. It can be configured as a digital protection relay.

The digital protective relay cuts out and controls a circuit breaker installed at each transmission line to open and close each transmission line. The circuit breaker can provide open / closed (also called input) operation status information, and can generate power and various measurement and relay information.

Referring to FIG. 2, the HVDC output control apparatus 100 according to the present invention includes an input unit 100a, an operation unit 100b, and a control unit 100c.

The input unit 100a may include a communication unit, a signal converter, and a memory for storing setting data.

The input unit 100a inputs input data of the first region and the second region including the flow rate and facility capacity of the second power transmission lines 30a and 20a flowing into the first region and the second region. do.

The input unit 100a may include a tidal current value (inflow power amount) of the second transmission lines 30a and 20a flowing into each of the first region and the second region, and the second transmission line of the second region ( Enter the capacity values of 20a and 20b).

In addition, the input unit 100a further inputs operation state information of closing or opening of the circuit breakers of the second power transmission lines 20a and 20b of the second region.

Here, the closed state of the circuit breaker may indicate that the second transmission line (20a, 20b) is installed in the normal operation of the circuit breaker, the open state of the circuit breaker is the second transmission line ( 20a, 20b) may refer to a state in which a power supply is impossible as a fault condition due to an overcurrent or a short circuit accident on a circuit.

The input data input by the input unit 100a may be received and input from the digital protection relays installed in each of the second power transmission lines 20a and 20b as described above, for example, each of the second power transmission lines. The capacity values of the furnaces 20a and 20b may be preset and obtained from data stored in the memory included in the input unit 100a.

Based on the input data from the input unit 100a, the operation unit 100b adds the output variation value to be changed (see? P described later) and the output variation value to the previous output value (P _HVDC described later). Calculate a new output value (see P _{HVDC _NEW} described below).

The calculation unit 100b calculates the output variation value ΔP according to the following Equation 1.

----수식 1

---- Formula 1

는 상기 출력변동 값,

는 상기 제 1 지역으로 전력이 유입되는 n개의 송전선로 i의 조류 값의 합(단위는 MW),

는 이전의 출력 값(단위는 MW),

는 상기 제 2 지역으로 유입되는 x개의 송전선로 k의 조류 값의 합(단위는 MW),

는 상기 제 2 지역으로 유입되는 x개의 송전선로 k의 설비용량 값의 합(단위는 MVA), X와 Y는 보정계수이다.here,

Is the output variation value,

Is the sum of the tidal current values of the n transmission lines i into which power is introduced into the first region (unit is MW),

Is the previous output value (unit is MW),

Is the sum of tidal current values of x transmission lines k flowing into the second region (unit is MW),

Is the sum of the capacity values of the x power transmission lines k flowing into the second region (unit is MVA), and X and Y are correction factors.

The calculation unit 100b is configured to output only the capacity value of the second transmission line (see reference numeral 20a in FIG. 1) in which the circuit breaker of the second transmission line (see reference numeral 20a in FIG. 1) is closed. ), And the capacity value of the second transmission line in which the circuit breaker of the second transmission line (see symbol 20a in FIG. 1) is open is excluded from the calculation of the output variation value ΔP.

The calculation unit 100b calculates a new output variation value by the following expression (2).

----수식 2

---- Formula 2

는 새로운 출력 값(단위 MW),

는 이전의 출력 값,

는 상기 출력변동 값이다.here,

Is the new output value in MW,

Is the previous output value,

Is the output variation value.

The controller 100c outputs the new output value P _{HVDC _NEW} calculated by the calculator 100b to the first transmission line (see reference numeral 10 in FIG. 1) through the HVDC power transmitter 200.

The HVDC power transmission unit 200 is a means for applying power to the first transmission line (see reference numeral 10 in FIG. 1) according to the new output value P _{HVDC_NEW} output from the control unit 100c and transmitting the same. The transformer part and the converter part may be included.

Meanwhile, referring to FIG. 3 and assisting with reference to FIGS. 1 to 2, an HVDC output control apparatus and an HVDC output control method according to a preferred embodiment of the present invention will be described.

In the input step ST100, the input unit 100a includes a tidal current value (inflow power amount) of the second power transmission lines 30a and 20a flowing into the first region and the second region, respectively, of the second region. Input the capacity values of the second transmission line (20a, 20b) and operating state information of the closing or opening of the circuit breaker of the second transmission line (20a, 20b) of the second region.

In the next calculation step ST201, the calculation unit 100b calculates the output variation value ΔP using Equation 1 based on the input data provided by the input unit 100a.

In the next appropriate range deviation determining step ST202, the calculating part 100b determines whether the calculated output variation value ΔP is within a range of a preset upper limit value B and a lower limit value A. FIG.

In the appropriate range deviation determination step ST202, if the output variation value ΔP is within a range between a preset upper limit value B and a lower limit value A, it is regarded as a normal state and the HVDC output is converted into a new output value. Exit without change control.

In the appropriate range deviation determining step ST202, when the output variation value deviates from a range of a preset upper limit value and a lower limit value, the process proceeds to the next final output value calculation step ST203, and the operation unit 100b performs the above operation. Equation 2 is used to calculate the new output value (P _{HVDC _NEW} ) as the final output value.

Proceeding to the next control step ST300, the control unit 100c transmits the new output value P _{HVDC _NEW} calculated by the operation unit 100b through the HVDC power transmission unit 200 to the first transmission line (FIG. 1). Change to the new output value to be outputted in (10).

Thus, the operation of the HVDC output control device and the HVDC output control method according to the present invention can be completed.

As described above, the HVDC output control apparatus or the HVDC output control method according to the present invention, in the first transmission line for transmitting high voltage direct current from the second region to the first region, the two regions are connected to each other inflow It is configured to control the HVDC output to be output to the first transmission line in consideration of the tidal flow volume of the second transmission line and the capacity of the second region, it is possible to achieve the effect of reducing overload and optimal tidal control of the second region. .

10: first transmission line 20a: second transmission line (second area inflow side)
20b: second transmission line (second area outflow side)
30a: Second transmission line (first area inflow side)
30b: Second transmission line (first area outflow side)
40: input data source
100: HVDC output control device 100a: input unit
100b: operation unit 100c: control unit
200: HVDC power transmission unit

Claims (14)

In the HVDC output control device for a first transmission line that transmits ultra-high voltage direct current from the second region to the first region,
An input unit configured to input input data of the first region and the second region including a tidal flow amount and facility capacity of a second transmission line flowing into the first region and the second region;
A calculation unit calculating an output variation value to be changed and a new output value obtained by adding the output variation value to a previous output value based on the input data from the input unit; And
And a control unit for outputting the new output value calculated by the operation unit to the first transmission line. The method of claim 1,
The input unit is
And inputting a current value of the second power transmission line flowing into each of the first area and the second area, and a value of a capacity of the second power transmission line of the second area. The method of claim 2,
And the input unit further inputs operation state information of closing or opening of the circuit breaker of the second transmission line in the second region. The method of claim 3,
The operation unit,
HVDC output control device characterized in that for calculating the output variation value by the following equation,

here,

Is the output variation value,

Is the sum of the tidal current values of the n transmission lines i into which power is introduced into the first region (unit is MW),

Is the previous output value (unit is MW),

Is the sum of tidal current values of x transmission lines k flowing into the second region (unit is MW),

Is the sum of the capacity values of the x transmission lines k flowing into the second region (unit is MVA), and X and Y are correction factors. The method of claim 4, wherein
The operation unit,
The circuit breaker of the second transmission line is applied to calculate the output variation value only the capacity value of the second transmission line in the closed state, the circuit breaker of the second transmission line of the second transmission line HVDC output control device characterized in that the equipment capacity value is excluded from the calculation of the output variation value. The method of claim 4, wherein
The calculating unit calculates a new output variation value according to the following equation, HVDC output control device,

here,

Is the new output value in MW,

Is the previous output value,

Is the output variation value. In the HVDC output control method for the first transmission line for transmitting a very high voltage direct current from the second region to the first region,
An input step of inputting input data of the first region and the second region including the amount of tidal current and facility capacity of the second transmission line flowing into the first region and the second region;
Calculating a new output value obtained by adding an output variation value to be changed and the output variation value to a previous output value based on the input data input in the input step; And
And a control step of outputting the new output value calculated in the operation step to the first transmission line. The method of claim 7, wherein
The input step is
Inputting a tidal current value of the second transmission line flowing into each of the first region and the second region and a facility capacity value of the second transmission line of the second region. . The method of claim 8,
And the input step further comprises inputting operation state information of the closing or opening of the circuit breaker of the second transmission line in the second region. The method of claim 7, wherein
The operation step,
HVDC output control method characterized in that for calculating the output variation value by the following equation,

here,

Is the output variation value,

Is the sum of the tidal current values of the n transmission lines i into which power is introduced into the first region (unit is MW),

Is the previous output value (unit is MW),

Is the sum of tidal current values of x transmission lines k flowing into the second region (unit is MW),

Is the sum of the capacity values of the x power transmission lines k flowing into the second region (unit is MVA), and X and Y are correction factors. The method of claim 10,
The operation step,
The circuit breaker of the second transmission line is applied to calculate the output variation value only the capacity value of the second transmission line in the closed state, the circuit breaker of the second transmission line of the second transmission line HVAC output control method characterized in that the equipment capacity value is excluded from the calculation of the output variation value. The method of claim 10,
The calculating step is HVDC output control method, characterized in that for calculating a new output value by the following equation,

here,

Is the new output value in MW,

Is the previous output value,

Is the output variation value. The method of claim 10,
And an appropriate range deviation determining step of determining whether the output fluctuation value obtained in the calculating step is within a range of a predetermined upper limit value and a lower limit value. The method of claim 13,
In the determination of deviation from the appropriate range,
If the output variation value is within a range of a predetermined upper limit value and a lower limit value, it is regarded as a normal state and terminates without changing and controlling the HVDC output to a new output value.
And changing the HVDC output to a new output value obtained by adding the output variation value to a previous output value when the output variation value is out of a range of a preset upper limit value and a lower limit value. Output control method.

Images